EP0261319B1 - Circuit arrangement for producing an ac voltage - Google Patents

Circuit arrangement for producing an ac voltage Download PDF

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Publication number
EP0261319B1
EP0261319B1 EP87109023A EP87109023A EP0261319B1 EP 0261319 B1 EP0261319 B1 EP 0261319B1 EP 87109023 A EP87109023 A EP 87109023A EP 87109023 A EP87109023 A EP 87109023A EP 0261319 B1 EP0261319 B1 EP 0261319B1
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EP
European Patent Office
Prior art keywords
voltage
transistor
circuit arrangement
capacitor
arrangement according
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EP87109023A
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German (de)
French (fr)
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EP0261319A2 (en
EP0261319A3 (en
Inventor
Ziaedin Dr.-Ing. Chahabadi
Martin Dipl.-Ing. Brahms
Olaf Dipl.-Ing. Wittur
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KE Kommunikations Elektronik GmbH and Co
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KE Kommunikations Elektronik GmbH and Co
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Priority to AT87109023T priority Critical patent/ATE93668T1/en
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Publication of EP0261319A3 publication Critical patent/EP0261319A3/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters

Definitions

  • the invention relates to an electronic device with a circuit arrangement for generating an alternating voltage in the device, which is connected via a remote supply to a direct voltage and belongs to a system for transmitting digital signals which are transmitted via a connecting line connected to the device.
  • Such a circuit arrangement can be used, for example, to generate the ringing voltage in the "PCM 2" method used by the Deutsche Bundespost, in which two spatially adjacent subscribers to the public telecommunications network are jointly connected to the office via a connecting line.
  • PCM 2 pulse code modulation method with which telecommunications signals are transmitted as digital signals.
  • the analog signals are digitized in office and transferred to the connecting line.
  • a device is installed, through which the incoming digital signals are converted back into analog signals be implemented.
  • the two participants are connected to the device with connecting lines.
  • both subscribers can make calls simultaneously without mutual interference.
  • the two signal streams are "interleaved" in known technology at the beginning of the connecting line and separated again at the end thereof. Since the call voltage cannot be transmitted via the connecting line due to the digital signal transmission, it must be generated in the device.
  • CA-982 714 describes a circuit arrangement for generating an audible tone in a telephone system which is connected to a DC voltage superimposed by an AC voltage.
  • the frequency of this alternating voltage should be reproduced as an audible tone.
  • the frequency range of this tone is limited to avoid the influence of external signals, such as the noise induced by power lines.
  • FR-25 54 660 shows a circuit arrangement for a call signal generator of a private branch exchange.
  • a DC voltage is derived from the loop current of an exchange line, which is converted into a ringing voltage by chopping using a transistor circuit. This is controlled from the private branch exchange.
  • the voltage present on the exchange line is also stepped up by a flyback converter containing a comparator. For the function of this circuit arrangement it is important that the voltage on the exchange line breaks down again and again.
  • the invention has for its object to design the circuit arrangement described above so that in the end an AC voltage can be generated in a simple and compact manner on a digital transmission path of telecommunications signals.
  • This circuit arrangement manages with a simple structure with a few individual parts. It must therefore be accommodated in a very small space, so that the dimensions of the device in which the circuit arrangement is accommodated can be kept small.
  • the circuit arrangement works with high Efficiency, since almost only AC components are converted into active power. The energy to be dissipated in each case during the discharge process can advantageously be supplied again to the device's power supply.
  • a device 1 indicated by a dash-dotted line is connected.
  • the device 1 is powered, for example, with a voltage of 93 V via the connecting line ASL.
  • a power supply part 2 is connected to the remote supply, which can be a switched-mode power supply, for example.
  • the power supply part 2 can supply a lower voltage of, for example, ⁇ 5 V, to which the electronics 3 of the device 1 is connected, and a higher voltage of, for example, 20 V, to which a current source 4 and a circuit arrangement 6 for generating an AC voltage are connected. Basically, it is also sufficient if the power supply part 2 supplies only a voltage to which all components of the device 1 are connected.
  • An external consumer 7 is connected to the current source 4.
  • the circuit arrangement 6 is shown in more detail in FIG. 2.
  • the circuit arrangement is explained using the example of the PCM 2 system, the word “ringing voltage” being used instead of the word “AC voltage”.
  • the consumer 7 is the alarm clock of a telephone set, which is realized by a coupling capacitor CK and a resistor (load) RL, which together form the alarm impedance ZL.
  • the ringing voltage of, for example, 25 to 35 V effectively at 25 or 50 Hz is generated in the event of a call arriving at the exchange for one of the subscribers, in which the telephone connected to the device 1 is installed, by a signal transmitted by the exchange, in which it is can be a bit of the data stream transmitted from the exchange to the subscriber.
  • the data stream is received in device 1 and processed in electronics 3 in the same.
  • the electronics 3 has a clock 8, from which pulses of, for example, 64 kHz are derived.
  • the pulses are supplied to the control electrode of a transistor 1 via a control element 9, which is also present in the electronics 3 and which transmits the pulses or not, the current winding of which contains the primary winding of a transformer 10.
  • the control element 9 can be an AND operation, for example.
  • a field effect transistor, in particular a MOSFET, is preferably used as transistor T1.
  • a bipolar transistor can also be used.
  • the transistor T1 alternately becomes current-permeable or current-impermeable due to the pulses.
  • the voltage induced thereby by the transformer 10 is rectified on the secondary side via two diodes D1 and D2 located in different current paths and is used in each case for charging a downstream capacitor C1 and C2.
  • the first capacitor C1 is connected directly to the load to be driven (resistor RL) via the coupling capacitor CK, while the other capacitor C2 is connected to the control electrode is connected to a discharge transistor T2, the current path of which lies parallel to the coupling capacitor CK and to the first capacitor C1.
  • a resistor R2 is connected in parallel with the second capacitor C2, the resistance value of which is large in relation to the magnitude of the impedance ZL. The resistance value of R2 is determined by the current amplification factor of the discharge transistor T2.
  • the discharge transistor T2 is shown as a bipolar transistor. It can be replaced by a Darlington circuit. However, a field effect transistor, in particular a MOSFET, can also be used here.
  • the circuit arrangement according to the invention works as follows: After receiving a signal coming from the office via the connecting line ASL, the clock generator begins to transmit 8 pulses. These pulses are let through by the control element 9 since there is no voltage across the capacitor C1. The comparator 11 then outputs, for example, a logic "1" at its output. This happens as long as the voltage at the capacitor C1 is lower than the AC voltage supplied to the comparator 11 via its second input as a setpoint.
  • the transistor T1 Due to the pulses of the clock generator 8, the transistor T1 is switched in a continuous alternating current-impermeable and current-impermeable manner.
  • the voltage thereby induced by the transformer 10 charges the two capacitors C1 and C2 after rectification by the diodes D1 and D2.
  • the voltage across the capacitors C1 is continuously detected by the voltage divider R3 / R4 and fed to the comparator 11 as the actual value (point P).
  • point P the actual value
  • the control element 9 is thereby blocked, so that the pulses of the clock 8 no longer to the transistor T1 reach.
  • the charging process for the capacitors C1 and C2 is interrupted.
  • the parallel coupling capacitor CK is simultaneously charged with the capacitor C1. If the charging process is now interrupted, the capacitor C2 is quickly discharged via the resistor R2. The voltage at the control electrode of transistor T2 drops rapidly, so that it becomes current-permeable and thereby discharges the coupling capacitor CK and capacitor C1. The voltage at the voltage divider R3 / R4 then drops so far that a logic "1" is again present at the output of the comparator 11. The pulses from the clock generator 8 again reach the transistor T1 and the capacitors C1, C2 and CK are charged again. This process takes place in constant alternation until the clock 8 is switched off.
  • the energy of the coupling capacitor CK to be dissipated via the discharge transistor T2 can be returned to the voltage supply (higher voltage of the power supply part 2) via a diode D3, provided that every instantaneous value of the voltage applied to the RL is greater than the operating voltage.
  • the capacitor 12 is an element of the power supply part 2.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Rectifiers (AREA)
  • Control Of Electrical Variables (AREA)
  • Dc Digital Transmission (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Details Of Television Scanning (AREA)

Abstract

A circuit is described for producing an alternating voltage in an electronic device which is remotely fed over a digital transmission path. By the pulses of a clock (8) two capacitors, C1, C2 are charged via a transistor (T1) and a transformer (10), one of them (C2) being discharged over a parallel resistor (R2). A coupling capacitor (CK) which is charged by the other capacitor (C1) is discharged alternately by the influence of the dischargeable capacitor (C2) over a transistor (T2).

Description

Die Erfindung bezieht sich auf ein elektronisches Gerät mit einer Schaltungsanordnung zur Erzeugung einer Wechselspannung in dem Gerät, das über eine Fernspeisung an eine Gleichspannung angeschlossen ist und zu einem System zur Übertragung digitaler Signale gehört, die über eine mit dem Gerät verbundene Anschlußleitung übertragen werden.The invention relates to an electronic device with a circuit arrangement for generating an alternating voltage in the device, which is connected via a remote supply to a direct voltage and belongs to a system for transmitting digital signals which are transmitted via a connecting line connected to the device.

Eine solche Schaltungsanordnung kann beispielsweise zur Erzeugung der Rufspannung bei dem von der Deutschen Bundespost eingesetzten "PCM 2"-Verfahren verwendet werden, bei dem zwei räumlich benachbarte Teilnehmer des öffentlichen Fernmeldenetzes gemeinsam über eine Anschlußleitung mit dem Amt verbunden sind. Die weiteren Erläuterungen werden - stellvertretend für alle möglichen anderen Anwendungsfälle der Erfindung - für dieses System gemacht. Die Buchstaben "PCM" stehen für das bekannte Puls-Code-Modulations-Verfahren, mit dem nachrichtentechnische Signale als digitale Signale übertragen werden.Such a circuit arrangement can be used, for example, to generate the ringing voltage in the "PCM 2" method used by the Deutsche Bundespost, in which two spatially adjacent subscribers to the public telecommunications network are jointly connected to the office via a connecting line. The further explanations - representative of all possible other applications of the invention - are made for this system. The letters "PCM" stand for the well-known pulse code modulation method with which telecommunications signals are transmitted as digital signals.

Beim PCM 2-Verfahren werden die analogen Signale im Amt digitalisiert und auf die Anschlußleitung gegeben. Am Ende der Anschlußleitung ist ein Gerät installiert, durch das die ankommenden digitalen Signale wieder in analoge Signale umgesetzt werden. Das gilt selbstverständlich auch für die Gegenrichtung. An das Gerät sind die beiden Teilnehmer mit Verbindungsleitungen angeschlossen.With the PCM 2 process, the analog signals are digitized in office and transferred to the connecting line. At the end of the connection line, a device is installed, through which the incoming digital signals are converted back into analog signals be implemented. Of course, this also applies to the opposite direction. The two participants are connected to the device with connecting lines.

Wegen der digitalen Übertragung der Signale können beide Teilnehmer ohne gegenseitige Störung gleichzeitig telefonieren, Die beiden Signalströme werden dabei in bekannter Technik am Anfang der Anschlußleitung "verschachtelt" und am Ende derselben wieder getrennt. Da die Rufspannung wegen der digitalen Signalübertragung nicht über die Anschlußleitung übertragen werden kann, muß sie im Gerät erzeugt werden.Because of the digital transmission of the signals, both subscribers can make calls simultaneously without mutual interference. The two signal streams are "interleaved" in known technology at the beginning of the connecting line and separated again at the end thereof. Since the call voltage cannot be transmitted via the connecting line due to the digital signal transmission, it must be generated in the device.

In der CA-982 714 ist eine Schaltungsanordnung zur Erzeugung eines hörbaren Tons in einem Telefonsystem beschrieben, das an eine von einer Wechselspannung überlagerte Gleichspannung angeschlossen ist. Die Frequenz dieser Wechselspannung soll als hörbarer Ton wiedergegeben werden. Der Frequenzbereich dieses Tons wird begrenzt, um den Einfluß externer Signale zu vermeiden, wie beispielsweise die von Starkstromleitungen induzierten Geräusche.CA-982 714 describes a circuit arrangement for generating an audible tone in a telephone system which is connected to a DC voltage superimposed by an AC voltage. The frequency of this alternating voltage should be reproduced as an audible tone. The frequency range of this tone is limited to avoid the influence of external signals, such as the noise induced by power lines.

Aus der FR-25 54 660 geht eine Schaltungsanordnung für einen Rufsignalgenerator einer Fernsprechnebenstellenanlage hervor. Aus dem Schleifenstrom einer Amtsleitung wird hier eine Gleichspannung abgeleitet, die durch Zerhacken mittels einer Transistorschaltung in eine Rufspannung umgesetzt wird. Das wird aus der Nebenstellenanlage gesteuert. Die an der Amtsleitung anstehende Spannung wird außerdem durch einen einen Komparator enthaltenden Sperrwandler hochtransformiert. Für die Funktion dieser Schaltungsanordnung ist von Bedeutung, daß die Spannung an der Amtsleitung im Wechsel immer wieder zusammenbricht.FR-25 54 660 shows a circuit arrangement for a call signal generator of a private branch exchange. A DC voltage is derived from the loop current of an exchange line, which is converted into a ringing voltage by chopping using a transistor circuit. This is controlled from the private branch exchange. The voltage present on the exchange line is also stepped up by a flyback converter containing a comparator. For the function of this circuit arrangement it is important that the voltage on the exchange line breaks down again and again.

Der Erfindung liegt die Aufgabe zugrunde, die eingangs geschilderte Schaltungsanordnung so zu gestalten, daß am Ende einer digitalen Übertragungsstrecke von nachrichtentechnischen Signalen auf einfache und kompakte Weise eine Wechselspannung erzeugt werden kann.The invention has for its object to design the circuit arrangement described above so that in the end an AC voltage can be generated in a simple and compact manner on a digital transmission path of telecommunications signals.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst,

  • daß in dem Gerät ein Stromversorgungsteil angeordnet ist, das eine Spannung zum Betrieb der Elektronik des Geräts und zur Stromversorgung für mindestens einen externen Verbraucher erzeugt,
  • daß in dem Gerät außerdem ein Taktgeber vorhanden ist, dessen Impulse über einen Eingang eines Steuergliedes der Steuerelektrode eines Transistors zugeführt werden, in dessen Strompfad die Primärwicklung eines Transformators liegt,
  • daß an die Sekundärwicklung des Transformators in zwei unterschiedlichen Strompfaden je eine Diode mit nachgeschaltetem Kondensator angeschlossen sind,
  • daß der in Reihe mit einem Koppelkondensator liegende Verbraucher parallel zu dem ersten Kondensator und zum Strompfad eines Entladetransistors anschaltbar ist, an dessen Steuerelektrode der zweite Kondensator angeschlossen ist, zu dem ein ohmscher Widerstand parallel geschaltet ist,
  • daß parallel zu dem ersten Kondensator weiterhin ein den Momentanwert der Spannung an diesem Kondensator als Istwert erfassender Spannungsteiler angeschlossen ist, mit dessen Teilerpunkt ein Komparator mit einem ersten Eingang verbunden ist, dem über einen zweiten Eingang eine Wechselspannung als Sollwert zugeführt wird, und
  • daß der Ausgang des Komparators mit dem anderen Eingang des Steuergliedes verbunden ist.
According to the invention, this object is achieved by
  • that a power supply part is arranged in the device, which generates a voltage for operating the electronics of the device and for supplying power to at least one external consumer,
  • that the device also has a clock generator, the pulses of which are fed via an input of a control element to the control electrode of a transistor, in the current path of which the primary winding of a transformer is located,
  • that a diode with a downstream capacitor is connected to the secondary winding of the transformer in two different current paths,
  • that the consumer connected in series with a coupling capacitor can be connected in parallel to the first capacitor and to the current path of a discharge transistor, to the control electrode of which the second capacitor is connected, to which an ohmic resistor is connected in parallel,
  • that in parallel with the first capacitor a current value of the voltage on this capacitor is detected as an actual value voltage divider, with the dividing point of a comparator is connected to a first input, to which an AC voltage is supplied as a setpoint via a second input, and
  • that the output of the comparator is connected to the other input of the control element.

Diese Schaltungsanordnung kommt bei einfachem Aufbau mit wenigen Einzelteilen aus. Sie ist daher auf engstem Raum unterzubringen, so daß die Abmessungen des Geräts, in welchem die Schaltungsanordnung untergebracht ist, klein gehalten werden können. Die Schaltungsanordnung arbeitet mit hohem Wirkungsgrad, da fast nur Wechselstromanteile in Wirkleistung umgesetzt werden. Die jeweils beim Entladevorgang abzubauende Energie kann mit Vorteil der Stromversorgung des Geräts wieder zugeführt werden.This circuit arrangement manages with a simple structure with a few individual parts. It must therefore be accommodated in a very small space, so that the dimensions of the device in which the circuit arrangement is accommodated can be kept small. The circuit arrangement works with high Efficiency, since almost only AC components are converted into active power. The energy to be dissipated in each case during the discharge process can advantageously be supplied again to the device's power supply.

Vorteilhafte Ausgestaltungen der Erfindung gehen aus den Unteransprüchen hervor.Advantageous embodiments of the invention emerge from the subclaims.

Ein Ausführungsbeispiel des Erfindungsgegenstandes ist in den Zeichnungen dargestellt.An embodiment of the subject of the invention is shown in the drawings.

Es zeigen:

  • Fig. 1 als Blockschaltbild die Teile eines ferngespeisten Gerätes mit einer Schaltungsanordnung nach der Erfindung.
  • Fig. 2 die Schaltungsanordnung selbst.
Show it:
  • Fig. 1 shows a block diagram of the parts of a remotely powered device with a circuit arrangement according to the invention.
  • Fig. 2 shows the circuit arrangement itself.

Am Ende einer beispielsweise durch eine Fernmelde-Anschlußleitung ASL gebildeten Übertragungsstrecke ist ein durch eine strichpunktierte Linie angedeutetes Gerät 1 angeschlossen. Das Gerät 1 wird beispielsweise mit einer Spannung von 93 V über die Anschlußleitung ASL ferngespeist. An die Fernspeisung ist ein Stromversorgungsteil 2 angeschlossen, bei dem es sich beispielsweise um ein Schaltnetzteil handeln kann. Das Stromversorgungsteil 2 kann eine niedrigere Spannung von beispielsweise ± 5 V, an welche die Elektronik 3 des Geräts 1 angeschlossen ist, und eine höhere Spannung von beispielsweise 20 V liefern, an welche eine Stromquelle 4 und eine Schaltungsanordnung 6 zur Erzeugung einer Wechselspannung angeschlossen sind. Grundsätzlich reicht es auch aus, wenn das Stromversorgungsteil 2 nur eine Spannung liefert, an die alle Bauteile des Geräts 1 angeschlossen sind. An die Stromquelle 4 ist ein externer Verbraucher 7 angeschlossen. Die Schaltungsanordnung 6 ist in Fig. 2 genauer dargestellt.At the end of a transmission path formed, for example, by a telecommunication connecting line ASL, a device 1 indicated by a dash-dotted line is connected. The device 1 is powered, for example, with a voltage of 93 V via the connecting line ASL. A power supply part 2 is connected to the remote supply, which can be a switched-mode power supply, for example. The power supply part 2 can supply a lower voltage of, for example, ± 5 V, to which the electronics 3 of the device 1 is connected, and a higher voltage of, for example, 20 V, to which a current source 4 and a circuit arrangement 6 for generating an AC voltage are connected. Basically, it is also sufficient if the power supply part 2 supplies only a voltage to which all components of the device 1 are connected. An external consumer 7 is connected to the current source 4. The circuit arrangement 6 is shown in more detail in FIG. 2.

Die Schaltungsanordnung wird am Beispiel des PCM 2-Systems erläutert, wobei statt des Wortes "Wechselspannung" das Wort "Rufspannung" verwendet wird. Der Verbraucher 7 ist dabei der Wecker eines Telefonapparates, der durch einen Koppelkondensator CK und einen Widerstand (Last) RL realisiert ist, die zusammen die Weckerimpedanz ZL bilden.The circuit arrangement is explained using the example of the PCM 2 system, the word "ringing voltage" being used instead of the word "AC voltage". The consumer 7 is the alarm clock of a telephone set, which is realized by a coupling capacitor CK and a resistor (load) RL, which together form the alarm impedance ZL.

Die Rufspannung von beispielsweise 25 bis 35 V effektiv mit 25 oder 50 Hz wird im Falle eines beim Amt ankommenden Anrufs für einen der Teilnehmer, bei welchem das am Gerät 1 angeschlossene Telefon installiert ist, durch ein vom Amt ausgesendetes Signal erzeugt, bei dem es sich um ein Bit des vom Amt zum Teilnehmer übermittelten Datenstroms handeln kann. Der Datenstrom wird im Gerät 1 empfangen und in demselben in der Elektronik 3 verarbeitet. Die Elektronik 3 hat einen Taktgeber 8, von dem Impulse von beispielsweise 64 kHz abgeleitet werden.The ringing voltage of, for example, 25 to 35 V effectively at 25 or 50 Hz is generated in the event of a call arriving at the exchange for one of the subscribers, in which the telephone connected to the device 1 is installed, by a signal transmitted by the exchange, in which it is can be a bit of the data stream transmitted from the exchange to the subscriber. The data stream is received in device 1 and processed in electronics 3 in the same. The electronics 3 has a clock 8, from which pulses of, for example, 64 kHz are derived.

Die Impulse werden über ein ebenfalls in der Elektronik 3 vorhandenes Steuerglied 9, das die Impulse durchläßt oder nicht, der Steuerelektrode eines Transistors 1 zugeführt, in dessen Strompfad die Primärwicklung eines Transformators 10 liegt. Das Steuerglied 9 kann beispielsweise eine UND-Verknüpfung sein. Als Transistor T1 wird vorzugsweise ein Feldeffekttransistor, insbesondere ein MOSFET, verwendet. Es kann aber auch ein bipolarer Transistor eingesetzt werden. Der Transistor T1 wird durch die Impulse abwechselnd stromdurchlässig oder stromundurchlässig. Die dadurch vom Transformator 10 induzierte Spannung wird sekundärseitig über zwei in unterschiedlichen Strompfaden liegende Dioden D1 und D2 gleichgerichtet und jeweils zum Aufladen eines nachgeschalteten Kondensators C1 und C2 verwendet.The pulses are supplied to the control electrode of a transistor 1 via a control element 9, which is also present in the electronics 3 and which transmits the pulses or not, the current winding of which contains the primary winding of a transformer 10. The control element 9 can be an AND operation, for example. A field effect transistor, in particular a MOSFET, is preferably used as transistor T1. However, a bipolar transistor can also be used. The transistor T1 alternately becomes current-permeable or current-impermeable due to the pulses. The voltage induced thereby by the transformer 10 is rectified on the secondary side via two diodes D1 and D2 located in different current paths and is used in each case for charging a downstream capacitor C1 and C2.

Der erste Kondensator C1 ist über den Koppelkondensator CK direkt an die zu treibende Last (Widerstand RL) angeschlossen, während der andere Kondensator C2 mit der Steuerelektrode eines Entladetransistors T2 verbunden ist, der mit seinem Strompfad parallel zum Koppelkondensator CK und zum ersten Kondensator C1 liegt. Parallel zu dem zweiten Kondensator C2 ist ein Widerstand R2 angeschlossen, dessen Widerstandswert groß ist im Verhältnis zum Betrag der Impedanz ZL. Der Widerstandswert von R2 wird durch den Stromverstärkungsfaktor des Entladetransistors T2 bestimmt.The first capacitor C1 is connected directly to the load to be driven (resistor RL) via the coupling capacitor CK, while the other capacitor C2 is connected to the control electrode is connected to a discharge transistor T2, the current path of which lies parallel to the coupling capacitor CK and to the first capacitor C1. A resistor R2 is connected in parallel with the second capacitor C2, the resistance value of which is large in relation to the magnitude of the impedance ZL. The resistance value of R2 is determined by the current amplification factor of the discharge transistor T2.

Der Entladetransistor T2 ist als bipolarer Transistor dargestellt. Er kann durch eine Darlingtonschaltung ersetzt werden. Es kann aber auch hier ein Feldeffekttransistor, insbesondere ein MOSFET, eingesetzt werden.The discharge transistor T2 is shown as a bipolar transistor. It can be replaced by a Darlington circuit. However, a field effect transistor, in particular a MOSFET, can also be used here.

Die Schaltungsanordnung nach der Erfindung arbeitet wie folgt:
Nach Empfang eines über die Anschlußleitung ASL kommenden, vom Amt ausgesandten Signals beginnt der Taktgeber 8 Impulse auszusenden. Diese Impulse werden vom Steuerglied 9 durchgelassen, da am Kondensator C1 keine Spannung anliegt. Der Komparator 11 gibt an seinem Ausgang dann beispielsweise eine logische "1" ab. Das geschieht solange, wie die Spannung am Kondensator C1 niedriger als die dem Komparator 11 über seinen zweiten Eingang als Sollwert zugeführte Wechselspannung ist.The circuit arrangement according to the invention works as follows:
After receiving a signal coming from the office via the connecting line ASL, the clock generator begins to transmit 8 pulses. These pulses are let through by the control element 9 since there is no voltage across the capacitor C1. The comparator 11 then outputs, for example, a logic "1" at its output. This happens as long as the voltage at the capacitor C1 is lower than the AC voltage supplied to the comparator 11 via its second input as a setpoint.

Durch die Impulse des Taktgebers 8 wird der Transistor T1 in dauerndem Wechsel stromdurchlässig und stromundurchlässig geschaltet. Die dadurch vom Transformator 10 induzierte Spannung lädt nach Gleichrichtung durch die Dioden D1 und D2 die beiden Kondensatoren C1 und C2 auf. Die am Kondensatoren C1 anliegende Spannung wird dauernd durch den Spannungsteiler R3/R4 erfaßt und dem Komparator 11 als Istwert (Punkt P) zugeführt. Wenn die Spannung am Kondensator C1 den Sollwert überschreitet, erscheint am Ausgang des Komparators 11 eine logische "0". Das Steuerglied 9 wird dadurch gesperrt, so daß die Impulse des Taktgebers 8 nicht mehr zum Transistor T1 gelangen. Der Ladevorgang für die Kondensatoren C1 und C2 ist damit unterbrochen.Due to the pulses of the clock generator 8, the transistor T1 is switched in a continuous alternating current-impermeable and current-impermeable manner. The voltage thereby induced by the transformer 10 charges the two capacitors C1 and C2 after rectification by the diodes D1 and D2. The voltage across the capacitors C1 is continuously detected by the voltage divider R3 / R4 and fed to the comparator 11 as the actual value (point P). When the voltage across capacitor C1 exceeds the setpoint, a logic "0" appears at the output of comparator 11. The control element 9 is thereby blocked, so that the pulses of the clock 8 no longer to the transistor T1 reach. The charging process for the capacitors C1 and C2 is interrupted.

Mit dem Kondensator C1 wird gleichzeitig der parallel liegende Koppelkondensator CK aufgeladen. Wenn nun der Ladevorgang unterbrochen ist, wird der Kondensator C2 schnell über den Widerstand R2 entladen. Die Spannung an der Steuerelektrode des Transistors T2 sinkt schnell ab, so daß derselbe stromdurchlässig wird und dadurch den Koppelkondensator CK sowie den Kondensator C1 entlädt. Die Spannung am Spannungsteiler R3/R4 sinkt dann so weit ab, daß am Ausgang des Komparators 11 wieder eine logische "1" ansteht. Die Impulse des Taktgebers 8 gelangen wieder zum Transistor T1 und die Kondensatoren C1, C2 und CK werden wieder geladen. Dieser Vorgang läuft im dauernden Wechsel ab, bis der Taktgeber 8 abgeschaltet wird.The parallel coupling capacitor CK is simultaneously charged with the capacitor C1. If the charging process is now interrupted, the capacitor C2 is quickly discharged via the resistor R2. The voltage at the control electrode of transistor T2 drops rapidly, so that it becomes current-permeable and thereby discharges the coupling capacitor CK and capacitor C1. The voltage at the voltage divider R3 / R4 then drops so far that a logic "1" is again present at the output of the comparator 11. The pulses from the clock generator 8 again reach the transistor T1 and the capacitors C1, C2 and CK are charged again. This process takes place in constant alternation until the clock 8 is switched off.

Die über den Entladetransistor T2 abzubauende Energie des Koppelkondensators CK kann über eine Diode D3 zur Spannungsversorgung (höhere Spannung des Stromversorgungsteils 2) zurückgeführt werden, sofern jeder Momentanwert der an RL anliegenden Spannung größer als die Betriebsspannung ist. Der Kondensator 12 ist ein Element des Stromversorgungsteils 2.The energy of the coupling capacitor CK to be dissipated via the discharge transistor T2 can be returned to the voltage supply (higher voltage of the power supply part 2) via a diode D3, provided that every instantaneous value of the voltage applied to the RL is greater than the operating voltage. The capacitor 12 is an element of the power supply part 2.

Claims (7)

  1. Electronic devise having a circuit arrangement for generating an AC voltage in the device, which device is connected via a power feed to a DC voltage and belongs to a system for transmitting digital signals which are transmitted via a branch line connected to the device, characterised in that
    - there is arranged in the device (1) a power supply unit (2) which generates a voltage for operating the electronics (3) of the device (1) and for supplying power for at least one external load (7),
    - there is present in addition in the device (1) a clock generator (8) whose pulses are fed via an input of a control element (9) to the gate electrode of a transistor (T1) in the current path of which the primary winding of a transformer (10) is situated,
    - in that in two different current paths one diode (D1, D2) each, having a downstream capacitor (C1, C2), is connected to the secondary winding of the transformer (10),
    - in that the load connected in series with a coupling capacitor (CK) can be connected in parallel with the first capacitor (C1) and with the current path of a discharging transistor (T2) to the gate electrode of which there is connected the second capacitor (C2), with which an ohmic resistor (R2) is connected in parallel,
    - in that furthermore there is connected in parallel with the first capacitor (C1) a voltage divider (R3, R4) which detects the instantaneous value of the voltage at this capacitor (C1) as actual value and to the dividing point (P) of which there is connected a comparator (11) having a first input to which an AC voltage is fed as desired value via a second input, and
    - in that the output of the comparator (11) is connected to the other input of the control element (9).
  2. Circuit arrangement according to Claim 1, characterised in that the current directed via the discharging transistor (T2) is fed back to the power supply of the device (1).
  3. Circuit arrangement according to Claim 1 or 2, characterised in that the transistor (T1) is constructed as a field effect transistor, preferably as a MOSFET.
  4. Circuit arrangement according to Claim 1 or 2, characterised in that the transistor (T1) is constructed as a bipolar transistor.
  5. Circuit arrangement according to one of Claims 1 to 4, characterised in that the discharging transistor (T2) is constructed as a field effect transistor, preferably as a MOSFET.
  6. Circuit arrangement according to one of Claims 1 to 4, characterised in that a Darlington pair circuit is used instead of the discharging transistor (T2).
  7. Circuit arrangement according to one of Claims 1 to 6, characterised in that the power supply unit (2) is constructed as a switched-mode power supply.
EP87109023A 1986-09-26 1987-06-23 Circuit arrangement for producing an ac voltage Expired - Lifetime EP0261319B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87109023T ATE93668T1 (en) 1986-09-26 1987-06-23 CIRCUIT ARRANGEMENT FOR GENERATION OF AN AC VOLTAGE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3632746 1986-09-26
DE3632746A DE3632746C2 (en) 1986-09-26 1986-09-26 Circuit arrangement for generating an AC voltage

Publications (3)

Publication Number Publication Date
EP0261319A2 EP0261319A2 (en) 1988-03-30
EP0261319A3 EP0261319A3 (en) 1990-03-07
EP0261319B1 true EP0261319B1 (en) 1993-08-25

Family

ID=6310423

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87109023A Expired - Lifetime EP0261319B1 (en) 1986-09-26 1987-06-23 Circuit arrangement for producing an ac voltage

Country Status (7)

Country Link
US (1) US4799138A (en)
EP (1) EP0261319B1 (en)
CN (1) CN1006349B (en)
AT (1) ATE93668T1 (en)
DE (2) DE3632746C2 (en)
DK (1) DK171852B1 (en)
ES (1) ES2042521T3 (en)

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US5477175A (en) * 1993-10-25 1995-12-19 Motorola Off-line bootstrap startup circuit
DE4338863C2 (en) * 1993-11-13 1997-12-04 Kommunikations Elektronik Circuit arrangement for generating an AC voltage
CN1042279C (en) * 1995-10-26 1999-02-24 刘海先 Low voltage DC frequency changer for vehicle
US7288980B2 (en) * 2002-11-05 2007-10-30 Ip-First, Llc Multiple mode clock receiver
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CN102356438B (en) 2009-03-31 2014-08-27 伟创力国际美国公司 Magnetic device formed with u-shaped core pieces and power converter employing the same
US8514593B2 (en) 2009-06-17 2013-08-20 Power Systems Technologies, Ltd. Power converter employing a variable switching frequency and a magnetic device with a non-uniform gap
US9077248B2 (en) 2009-06-17 2015-07-07 Power Systems Technologies Ltd Start-up circuit for a power adapter
US8643222B2 (en) * 2009-06-17 2014-02-04 Power Systems Technologies Ltd Power adapter employing a power reducer
US8638578B2 (en) 2009-08-14 2014-01-28 Power System Technologies, Ltd. Power converter including a charge pump employable in a power adapter
US8976549B2 (en) * 2009-12-03 2015-03-10 Power Systems Technologies, Ltd. Startup circuit including first and second Schmitt triggers and power converter employing the same
US8520420B2 (en) 2009-12-18 2013-08-27 Power Systems Technologies, Ltd. Controller for modifying dead time between switches in a power converter
US9246391B2 (en) 2010-01-22 2016-01-26 Power Systems Technologies Ltd. Controller for providing a corrected signal to a sensed peak current through a circuit element of a power converter
US8787043B2 (en) * 2010-01-22 2014-07-22 Power Systems Technologies, Ltd. Controller for a power converter and method of operating the same
CN101846967A (en) * 2010-03-17 2010-09-29 上海大学 Embedded standby energy-saving method and device
WO2011116225A1 (en) 2010-03-17 2011-09-22 Power Systems Technologies, Ltd. Control system for a power converter and method of operating the same
CN102834817B (en) * 2010-03-26 2016-08-03 电力系统技术有限公司 There is the power adapters of universal serial bus concentrator
US8792257B2 (en) 2011-03-25 2014-07-29 Power Systems Technologies, Ltd. Power converter with reduced power dissipation
US8792256B2 (en) 2012-01-27 2014-07-29 Power Systems Technologies Ltd. Controller for a switch and method of operating the same
US9190898B2 (en) 2012-07-06 2015-11-17 Power Systems Technologies, Ltd Controller for a power converter and method of operating the same
US9106130B2 (en) 2012-07-16 2015-08-11 Power Systems Technologies, Inc. Magnetic device and power converter employing the same
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US9379629B2 (en) 2012-07-16 2016-06-28 Power Systems Technologies, Ltd. Magnetic device and power converter employing the same
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Also Published As

Publication number Publication date
DE3787142D1 (en) 1993-09-30
DK500287A (en) 1988-03-27
ATE93668T1 (en) 1993-09-15
EP0261319A2 (en) 1988-03-30
US4799138A (en) 1989-01-17
CN87106586A (en) 1988-04-13
DE3632746C2 (en) 1995-04-13
DK500287D0 (en) 1987-09-23
CN1006349B (en) 1990-01-03
ES2042521T3 (en) 1993-12-16
DE3632746A1 (en) 1988-03-31
DK171852B1 (en) 1997-07-07
EP0261319A3 (en) 1990-03-07

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